#include<iostream>
#include <string>
using namespace std;
// Node
class Symbols
{
private:
    // represent the identifier
    string identifier;
    // an integer to represent the identifier’s value
    int value;
    int performOperation(string operation, int value);
public:
    // constructor
    // get identifier and calculate value from statements
    Symbols(string statements);
    // desctructor 
    ~Symbols();
};

